一日一成语【267】let one’s hair down 轻松一下；毫无拘束

let one’s hair down
[俗]轻松一下；随随便便；毫无拘束

I hardly let my hair down in he presence of my would-be father-in-law.
在我未来的岳父面前我总是很拘束。

注解：
to let one’s hair down系指拿下发针，使头发垂落肩头，喻指除去表面装饰，使自己无拘无束、轻松、自然。